Liquid-fuel burner.



c. H. sWANsoN.

LIQUID FUEL BURNER.

l APPLICATION FILED JULY 26, |913..

Patented Apr.. 13, 1915.

CHARLES H. SWANSOhLOE` CHICAGO, ILLINOIS, ASSIGNOR T0 THE A & A. MANUFAC- i TUBING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LreUrDQrUnL BURNER.

ideama.

Specification of Letters Patent.

Patented dpr. 13, 1915.

Application filed .Tuly 26, 1913. Serial No. 781,301.

T0 all whom it may concern:

-Be it known that I, CHARLES H. SWAN- soN, a citizen of the United States, residing at Chicago, in the county. of Cook and State of Illinois, have invented certain new and useful Improvements in Liquid-Fuel Burners, of which the following is a'specication.

My invention relates to liquid fuel burners, and refers particularly, although not exclusively, to burners which are adapted to be used in connection with torches.

In the past it has been a matter of great diiiculty to obtain a liquid fuel torch in which the combustion is suiiiciently perfect in order to make it possible to use a low grade liquid fuel, such as kerosene or the like. I have discovered that very perfect combustion may be obtained by providing one or more preheating tubes, preferably U-shap'ed, which communicate on one end with the source of liquid fuel and through which the fuel passes and is gasified before it reaches the nozzle of the burner. On esleaping from this nozzle the fuel is ignited and the Haine comes in proximity with the preheating tube or tubes so that the liquid fuel is gasified Vin such tubes. The preheating tube or tubes are attached at their ends to a head, which is provided with a passage communicating with the interior of the tubes, this passage .being controlled by means of a suitable valve. Inclosing the preheating tube or tubes is a flame retaining shell which is apertured in order to admit the necessary air for purposesof perfect combustion. These and other advantages of my invention will be more readily under stood by reference to the accompanying drawings, in which Figure 1 is a vertical longitudinal section through the burner, in connection with which a portion of the tank with which the burner may be used is shown; Fig. 2 is a plan of the burner, the fiame retaining shell being shown in longitudinal section; and Fig. 3 is a fragmentary vertical section showing the method of connecting the-burner tube to the tank tube.

The burner, which constitutes the subjectmatter of my invention, consists of a head 10 having therein a passage 11 closed by the plug 12 and a passage 13v communicating with the passage 11. At the end of the passage 13 adjacent. to the passagel 11 `is the valve seat 14 adapted to be engaged by the needle valve 15 controlled by the handle 16 and having threaded engagement with the projection 17 which is preferably integral with the head 10. The head 10 also is provided with the nozzle lug 18 into which the nozzle 19 is screwed, this nozzle communicating with the passage 11 of the head 10.1'`

At its upper end the head 10 is provided with the boss 20 through which the passage 13 extends, and to this boss is fastened one end of each of the U-shaped preheating tubes 21, 21.` In the drawings I have illustrated two of these preheating tubes, but it will be understood that a single tube, or any number, may be employed ywithout departing from the spirit of my invention. The tubes 21 have their ends projecting slightly into the boss 20 in order to form a substantial connection therewith. If more than a single preheating tube is used, the passage 13 is flared at its end in order to establish connection with all of these tubes.

At its lower end the head 11 has the boss 22 to which the opposite ends of the preheating tubes 21 are attached, these tubes preferably projecting slightl into the boss 22. 'Ihe boss 22 is provide with the passage 23, which communicates with the preheating ltubes 21 and the burner tube 24:.

yThe burner tube 24 is attached by any suitplug27. 'Ihe tank tube 25 passes to a point near the bottom of the tank 28. The tank 28 is supplied with the air pump 29, of any suitable construction. 'Ihe top of the tank has a depression forming the priming cup 30.

Attached tothe bosses 2O and 22 of the head 10 is thefretainingring 31,v which is adapted to receive the removable retaining shell 32, the inner surface of which engages the preheating tubes 21. The flame retain- Aing shell 32 has the air inlet aperture 33 near its base, and is also preferably provided with the apertures 34, the purpose of which will be explained hereafter. The fla-me retaining shell 32 also is provided with the end member 34 which serves to contract; and direct the flame, as will be presently described.

As best shown in Fig. 2, the preheating tubes 21 engage each other through the portions of the tubes adjacent to the bosses `and 22, but are separated from each other through the portions 35 of said tubes in order to allow the free passage of 'combustible gases and the flame resulting therefrom.

Having thus described the construction of my improved burner, its operation may now be readily understood.

A readily combustible liquid, such as alcohol orthe like, is placed in the priming cup 30, and on. boing ignited serves to heat the l burner-tube 24 and the lower portions of the preheating tubes 21. After these tubes have been thoroughly heatedv and after air has been pumped into the tank 28 by means of the pump 29, (in order to force the liquid fuel within the tank 28 up through the tank tube 25) the valve l5, which has been previously seated against its seat 14, is o ened so that the fuel which has been gasi ed in the burner tube 24 and the lower portions of the preheating tubes 2l is allowed to pass from the passage 13 into thepassage 11. This gas next passes throughv the nozzle 19, vand on account of its pressure air is drawn in through the apertures 33 of the flame retaining shell and is mixed with said combustible gases. These gases then ignite toward the outlet end of the flame retaining shell 32, and serve to heat the preheating tubes 21. By means of the end member 34 the flames are concentrated and directed as desired. The apertures 34L act as additional air inlets to aid in producing perfect com- Kbustion. l

It will be evident from the above description that the preheating tubes 21 are con-y stantly subjected to the heating action of the burning gases coming from the nozzle- 19, and in this way the liquid fuelpassing through said tubes is gasied long before it reaches the ends of the preheating tubes which are attached to the boss 20.

I have found that by my improved construction very perfect combustion is prothe liquid fuel is gasiie duced so that a low grade fuel, such as kerosene, may readily be employed with excellent results.

It will be apparent to those skilled in the art that many changes could be made in the detailed construction of the parts which I have described without departing frorn` the spirit or scope of my invention.

What l claim is:

1. In a liquid fuel burner, the combination of a preheating tube adapted-for connection with a source of fuel, of a head having a passage therein communicating with said preheating tube and having a portion at substantially a right-angle thereto2 said passage provided with a valve seat adjacent to said preheating tube, a valve adapted to engage said seat and to interrupt the iiow of fuel through said passage, and a nozzle communicating with said passage in said portion of the latter at substantially a rightangle to said preheating tube, said nozzle adapted to direct the ignited fuel into proximity with said preheating tube, whereby f the liquid fuel is gasified in its passage through said tube.

2. In a liquid fu'el burner, the combination with a U-shaped preheatin tube, of a head having an outlet passage t erein communicating with one end of said preheating tube and an inlet passage communicating with the opposite end of said preheating tube, said outlet passage provided with a valve seat near one end thereof, a valve adapted to engage said seat and to interrupt the flow of fuel through said passage, and a nozzle communicating with said passage near the opposite end thereof and located substantially midway between the points of communication of said outlet passage with one end of said preheating tube and of said inlet passage with the opposite end of said preheating tube, said nozzle adapted to direct the ignited fuel into proximity with said preheatin tube, whereby in its passage through said tube.

CHARLES H. swANsoN.

lVitnesses MARGo'r SAHLIN, W. F. WARRIOR. 

